Jeromy Evans on 01/05/08 14:49, wrote:
That way you could remove all the boilerplate from your actions.
eg, If it placed the model into the actioncontext you could
potentially use
<s:select name="state" list="#states"/>
without your action providing the list or getter at all (except
something must instruct the interceptor to load it).
Just some ideas.
I thought about putting it all in the interceptor but I think it
could get unwieldy once the application grows.
Plus, there may be logic in the list call to restrict the list in
some way. I guess you could do that in an interceptor by casting your
action to what you know it is and then calling the required methods
on your model.
My boiler plate code isn't so bad, and in fact the only boiler plate
stuff is the catch block.
By the way, how would you figure out what the method being called is?
Hard-code a call to fetch anything prefixed "method:" from the HTTP
params? Or is there something on the Struts API already?
Is there an easier way?
String method =
ServletActionContext.getActionContext(request).getActionInvocation().getProxy().getMethod();
That's the right place. It's available as an argument in the
intercetpor. PrepareInterceptor is doing exactly that when it looks for
the presence of the Preparable interface on your action, and then for a
methods matching the prepare<methodName>() signature.
In that case, I shall ditch PrepareInterceptor and code another, along with an
interface for the action to implements:
interface DropdownListHelper {
prepareDropdowns(String methodName);
}
I'll pull the error handling into the interceptor as well, and then all I need
in the Action.prepareDropdowns() is a couple of if switchblocks to call the
right managers:
public void prepareDropdowns(String methodName)
{
if (methodName.equals("read")
|| (methodName.equals("save") && hasErrors()))
{
getRequest().setAttribute(
WildlifeJstlConstants.DROPDOWN_SPECIES_HABITAT.toString(),
habitatManager.search(0, 0));
}
}
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